Versarien said some of the £1.5m raised earlier in March have already enabled capital equipment to be purchased and installed at 85%-owned Cambridge Graphene.
The company acquired its majority holding in Cambridge Graphene in January, which was followed by the fund raising.
"This equipment, operated by the existing Cambridge Graphene team, supplemented by recently added personnel, is already producing graphene for customers in sample quantities," said Versarien in a statement.
"Further testing and commissioning of capital equipment is ongoing to enable the Company to scale up its graphene manufacturing capability," it added.
At 9:58am: (LON:VRS) Versarien PLC share price was +2p at 20.5p